Fe–Si–B–P–Cu Nanocrystalline Alloy Ribbons With High Saturation Magnetic Flux Density Prepared Using Industrial Materials

Abstract

Magnetic properties and fine structure of Fe-Si-B-P-Cu nanocrystalline alloy ribbons have been investigated. The Fe84.8(Si,B,P)14Cu1.2 alloy ribbons using industrial materials are produced by a single-roller melt-spinning method in air. The Fe84.8(Si,B,P)14Cu1.2 nanocrystalline alloys exhibit low coercivity Hc of 7-20 A/m in the compositional range of Si=0-2 at% and P=2-8 at% and high saturation magnetic flux density Bs of 1.80 T or more in the compositional range of P=0-4 at%. In particular, Fe84.8Si1B10P3Cu1.2 nanocrystalline alloy annealed at 698 K exhibits both the high Bs of 1.82 T and the low Hc of 7.2 A/m. The iron loss W at 50 Hz of the Fe84.8Si1B10P3Cu1.2 nanocrystalline alloy is much smaller than oriented and nonoriented magnetic steel over the maximum induction Bm range up to 1.7 T. In addition, nanocrystalline structure of the Fe84.8Si1B10P3Cu1.2 alloy exhibits a homogeneous nanocrystalline structure composed of α-Fe grains with 5-20 nm in diameter even using industrial materials. Therefore, the Fe-Si-B-P-Cu nanocrystalline alloy has good soft magnetic properties and a large economical advantage of low material cost by using industrial materials.